package com.nowcoder.community.controller;

import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Controller
public class HomeController implements CommunityConstant {

    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private UserService userService;

    @Autowired
    private LikeService likeService;

    @RequestMapping(path = "/index",method = RequestMethod.GET)
    public String getIndexPage(Model model, Page page,
                                @RequestParam(name="orderMode",defaultValue = "0") int orderMode){
        //方法调用钱，SpringMVC会自动实例化Model和Page,并将Page注入Model.
        // 所以，在thymeleaf中可以直接访问Page对象中的数据
        page.setRows(discussPostService.findDiscussPostRows(0));

        page.setPath("/index?orderMode="+orderMode);
        List<DiscussPost> list = discussPostService.findDiscussPosts(0,page.getOffset(), page.getLimit(),orderMode);
        List<Map<String,Object>> discussPosts = new ArrayList<>();
        if(list!=null){
            for(DiscussPost post:list){
            Map<String,Object> map = new HashMap<>();
            map.put("post",post);
            User user = userService.findUserById(post.getUserId());
            map.put("user",user);

            long likeCount = likeService.findEntityLikeCount(ENTITY_TYPE_POST, post.getId());
            map.put("likeCount",likeCount);

            discussPosts.add(map);
            }
        }
        model.addAttribute("discussPosts",discussPosts);
        model.addAttribute("orderMode",orderMode);
        return "/index";
    }


    /**
     * 服务器异常
     * @return
     */
    @RequestMapping(path = "/error",method = RequestMethod.GET)
    public String getErrorPage(){
        return "/error/500";
    }

    /**
     * 拒绝访问
     * 无页面或无权限
     * @return
     */
    @RequestMapping(path = "/denied", method = RequestMethod.GET)
    public String getDeniedPage() {
        return "/error/404";
    }

}
